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View of the three Cyanide Fumigation Chambers.
Mechanical disinfestation by cyanide gas adopted in Hackney in 1935, and extended in 1938.
Method.—On left of photograph is shown the specially designed and constructed brick-built
chambers erected in 1935. These include one chamber 26 feet long, into which vans are driven.
The smaller chamber (built-on) measuring 6 feet 8 inches long, is used for dealing with small
quantities of goods. Chambers are locked and sealed, cyanide gas released by mechanical methods.
Operators not required to wear masks.
On right of photograph is shown chamber of improved design and construction, including
circulatory system for gassing and ventilation. Photograph of system shown.